Pith Number

pith:ZA77DWYY

pith:2018:ZA77DWYY5SCRSCSUX7VBUOQMMT

not attested not anchored not stored refs pending

How Constraints Affect Content: The Case of Twitter's Switch from 140 to 280 Characters

Ashton Anderson, Kristina Gligori\'c, Robert West

arxiv:1804.02318 v2 · 2018-04-06 · cs.SI

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZA77DWYY5SCRSCSUX7VBUOQMMT}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T00:18:48.629689Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c83ff1db18ec85190a54bfea1a3a0c64dc45e3c2c3af07a4c550f78608d8b44c

Aliases

arxiv: 1804.02318 · arxiv_version: 1804.02318v2 · doi: 10.48550/arxiv.1804.02318 · pith_short_12: ZA77DWYY5SCR · pith_short_16: ZA77DWYY5SCRSCSU · pith_short_8: ZA77DWYY

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/ZA77DWYY5SCRSCSUX7VBUOQMMT \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: c83ff1db18ec85190a54bfea1a3a0c64dc45e3c2c3af07a4c550f78608d8b44c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "26cb5ae5ee80f1c329e5eaa10e9fefcf91aef772e87f3893a0b6a251192106d7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.SI",
    "submitted_at": "2018-04-06T15:11:23Z",
    "title_canon_sha256": "3b71cae7c20c9e98fb8511cf5a24205f90014c99eda1519e868c353d71c87b09"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.02318",
    "kind": "arxiv",
    "version": 2
  }
}